Gearing.



F. A. WARD.

GEARING.

APPLIOATION FILED AUG. 2. 1909.

Patented July 26, 1910.

2 SHEETS-SHEET 1.

P. A. WARD.

GEARING.

APPLIOATIOH FILED AUG. 2. 1909.-

965,'774. l rammed July 26, 1910.

2 SHEETS-SHEET 2.

UNITED STATES PATENT oEEicE.

FREDERICK A. WARD, F DETROIT, MICHIGAN', ASSIGNR TO GEAR GRINDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

GEARING.

specmcation of Letters Patent.' Patented July 26, 1910,

Application led August 2, 1909.

Serial No. 510,697.

To all whom it may concern:

Be it known that I, FREDERICK A. WARD, a

citizen of the United States of America,4 rereference being had'therein to the accompanying drawings.

The invention relates to gearing, more particularly designed for use in connection with the indexing mechanism of gear grinding machines, and'it is the object of the invention to obtain a positive and accurate adjustment and one having considerable range of variation.

To this end, the invention consists in various features of construction as hereinafter set forth.

In the drawings- Figure l is a sectional elevation of the machine; Fig. 2 is a perspective view of the ma'chine, and Fig. 3 is a Tect-ion taken at right angles to the plane of My improved mechanism is applicable to various constructions of machines, but, as shown, it is used in connection with a gear grinding machine, in which A. is a grinder wheel and B a. reciprocatory carriage on which said' wheel is mounted.-

C is a rotary cam for reciprocating the carriage and D a rotatively adjustable arbor or workholder. The indexing` device is arranged to be automatically operated by mechanism timed in relation to the com C and by its operation the arbor D is intermittently adjusted a predetermined amount, the construction being as follows: E and E are tight and loose pulleys upon a shaft F, upon which is mounted a worm Gr meshing with the worm wheel H, which actuates the shaft I having the cam Q thereon. This cam C is so positioned as to impart to the reciprocatory carriage B an intermittent movement, and during the period of rest of the carriage the indexing mechanism is operated. This mechanism includes a positively actuated clutch for automatically coupling and disen aging the drive gear 'from the .shaft I, an a train of' mechanlsm, mcluding a change gearing, through which the movement is transmltted to the arbor D.

In order to secure a positive and absolutely accurate adjustment of the indexing mechanism I employ a type of clutch of the 4than the spring P.

following construction: K are shoulders upon the gear wheel J, preferably formed of hardened blocks secured to said wheel, and accurately spaced from each other. As shown, two of these blocks are employed, and they are arranged at diainetrically opposite points on the wheel. L is a dog carried by the drive member' and adjustable thereon into and out of the pathof the members K. The member L is also preferably provided with a hardened block M for contacting with the blocks K, and, as shown, this member is radially slidable in bearings formed by lugs Non a drive Wheel O rotating with the shaft I. P is a spring operating to project the member L so that the block M is in the path of the blocks '1Q Q, is a disengaging member actuated byfsy'ings Q of greater tension This member Q, is arranged at a lli'xed point in the travel of the member In. and is' adapted to bear against said member. to actuate the same against the tension of ".tli'c'spring P, but, to secure a fixed time of dieran-ga ement, means is provided for temporarily Iocking the member L from movementcomprising a fixed cam R, which engages with a projecting finger R` on the member L. The arrangement is such that the finger R will travel into contact with the cam R before enga ement with the member Q, and as long as gie members R and R are thusengaged the member L is held from radial movement. During the continued engagement, the springs Q, are placed under tensin, and finally thezinger R passes beyond the end of the member R and is released therefrom. These springs will instantaneously actuatc the member Q, and the member L thereby, so as to drop the block M from thel path of the block K and permit the latter` to remain stationary.

It will be understood from the description given above that the gear wheel J remains stationary during the period in which the member L is traveling between the blocks 'K, and after contact of the block M with S and Ss, the

bevel gear vvheels S* S", shaft S, worm S', i

and worm gear S, which latter is mounted on the arbor D. This train is locked from movement during the interval in which the flange is disengaged, preferably through the medium of a locking dog T, which engages a notch in the eriphery of a disk U secured' to the gear W eel S. The gear Wheels J and S are preferably in the proportion of two to one, and as the formermoves exactly one-half of a revolution upon each actuation by the member Lit is evident that the gear- -wheel S and disk U will complete one full revolution. Thus by disengaging the dog T simultaneous with the engagement of the block M with the block K the train is unlocked and is permitted to move until the dog T rengages with the notch in the disk U, which occurs at the time of .disengagement of the block M from the block K. As shown, a pin V on the wheel O engages with an operating finger T on the dog to dis engage it from the notched wheel U against the tension of a spring W. Asimilar pin V again actuates the finger T just before registration of the notch in the wheel'U with the dog, thereby tensioning the spring W and causing a snapping of the dog'into the' notch u on the release of the fin er from the pin. Tiie variation in degree o adjustment is accomplished by exchanging the gears in the train, and for 4this purpose the gears S S2 S3 are detachably mounted.

With the construction as described in operation, continuous rotation of the shaft I will cause the alternate reciprocation, of the gear wheel J, W'liich, through the intermedi-V ate train, gives the desired adjustment tothe arbor D, upon which'the Work is mounted.

Of course it is to be understood that I have not attempted to describe the immerous modifications of the construction that may be adopted Without digressing from' m inventive idea.

at I claim as my inventionfis:

1. The combination of a member to be adjusted, an intermittently actuated member to o erate the same, a constantly driven mim er, means for periodically coupling said constantly driven member and intermittently actuated member, and means to si multaneously disengage said coupling means and lock said intermittently actuated member.

2. The' combination of a member t0 be adjusted, a member to operate the same, a constantly driven device, means for couplinfr said second memberto said device, an means for simultaneously'disengaging said coupling means and, locking said second member, and for simultaneously engaging said coupling .means and runlocking said member.

3. The combination of a member'to be adjusted, an intermittently actuated member 'tooperate the same, means to lock s'aid intermittently actuated member during its inter-` val of inaction, aconstantly driven member, and means to unlock said intermittently actuated member and couple said constantly driven member thereto.

4. The combination of a member to be adjusted, an intermittently actuated member Ato operate the same, means to lock said intermittently actuated member, aconstantly driven member, means to couple the constantly driven member periodically to' the intermittently actuated member, and means to uncouple said members and simultaneously lock the intermittently actuated member. ,N

5. In mechanism such as'described, the combination with a member to be ad'usted, of an intermittently actuated mem 'cr, n changeable transmission train between said intermittently actuated member and said vs Y member to be adjusted, means for locking said intermittently actuated member during its interval of inaction, a constantly driven.

member, and means timed b said con: stantly driven member for un ocking said intermittently driven member` for couplin` said constantly driven member thereto and for simultaneously uncoupling said members and locking said intermittently actuated member.

6.'In mechanism such as described, the combination with the member to be adjusted, of a constantly rotating jacent rotatable axially alined member, a series of accurately positioned shoulders on one of said members, and a cooperating movable interlocking device on the other of said members; means for yieldingly holding said interlocking device in position for engagement with said shoulders fixedl ositioned, means for holding said interibcliin device from disengagement, means engage and placed under tension by said interlockin" device while held from disenfrag'emen a apted to instantaneously disengageA the member, an ad.

same when released from said holding means, and a changeable transmission train between said adjacent member and the mem-` ber to be ad`usted.V

7. In mec anism such as described, the combination with the member to be adjusted, of actuating means therefor, including a rotatable member; an adjacent constantly V`tatin rotating -axially alined member, interlocking means lbetween said members, including a movable member on said constantly romember, and a series of accurately positioned shoulders on the adjacent member, a yieldably` pressed member-for engaging with said mvablegmember to disengage the same from the copeatingshoulder, and a iixed cam for temporarily holding said movable member from disengagement( and for causing the same to tension said ably pressed member whereby upon 'sengagement from said cam, anV instantaneous disengagement of said interlocking means is effected. 8. In mechanism such as described, the

combination with the member to be adjusted, of a rotatable actuating member there` for, an adjacent axially atlined constantly rotating member, interlocking means between said members, including a movable member on said constantly rotating member; a yieldably pressed member in the path of said movable member during the rotation of said constantly-rotating member, a stationary cam for engaging said movable member and for holding the same from relative movement on its carrying membe1;dur ing the engagement with said yieldably\ pressed member whereby the latter is placed under tension and will effect an instantaneous disengagement of said interlocking means upon the release from said cam.

9. In mechanism such as described, the combina-tion with the member to be adjustw ed, of a changeable transmission train for actuating said member, aA constantly rotating member adjacent to and axially alined with the actuating member of said transmission train, a clutch for coupling' saidadjacent members having accurately ositioned points of engagement, and means or instantaneously dlsengaging said clutch upon the completion of an accurately determined travel from the point of engagement.

`eirlrogf ,an intermittently actuated member member, a osive clutch for-periodically coupling said constantly driven member and intermittently actuated member, and means for simultaneousl disengaging said clutch and locking sai intermittently actuated member.

combination with the member to be adjusted, an intermittently actuatedmember for adjusting the same, .a constantly driven member, a. positive clutch for periodically coupling said constantl driven member and intermittently actuate member, and means for simultaneously and instantaneously disengaging said clutch and locking said intermittently actuated member. i \In\testimony whereof I aiix my signature in presenceof two witnesses.

i FREDERICK A. WARD.

i lVitnesses WV. J. .BELKNAP,

HARRY W. GRAHAM.

for operating the same, a constantly driven 45 10, In mechanism suchas described, the \combination with the member to be adjustf j 11. In mechanism such' a's described, the p 

